Acer 505 series - Manual (Page 79)

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Disconnecting from the desktop
Follow these steps to disconnect your computer from external accessories:
1. Save your work in progress.
2. Shut down the operating system.
3. Turn off the computer.
4. Disconnect the cord from the AC adapter.
5. Disconnect the keyboard, pointing device, printer, external monitor, and other
external devices.
6. Disconnect the Kensington lock if you are using one to secure the computer.